
<style>
#split-test { --second-size: 25%; }

</style>
<split-panels id="xxx" class="fluent-splitter" direction="row" barsize="8" blazor:onsplittercollapsed="1" blazor:onsplitterresized="2">
  <div slot="1">render me</div>
  <div slot="2">render me</div>
</split-panels>